const withData = param => {
	return param < 10 ? '0' + param : '' + param;
}

const getLoopArray = (start, end, unit) => {
	let $start = start || 0,
		$end = end || 1,
		array = [];
	for (let i = $start; i <= $end; i++) {
		array.push(withData(i) + unit);
	}
	return array;
}

const getMonthDay = (year, month) => {
	let flag = year % 400 == 0 || (year % 4 == 0 && year % 100 != 0),
		array = null;

	switch (month) {
		case '01':
		case '03':
		case '05':
		case '07':
		case '08':
		case '10':
		case '12':
			array = getLoopArray(1, 31, '日')
			break;
		case '04':
		case '06':
		case '09':
		case '11':
			array = getLoopArray(1, 30, '日')
			break;
		case '02':
			array = flag ? getLoopArray(1, 29, '日') : getLoopArray(1, 28, '日')
			break;
		default:
			array = '月份格式不正确，请重新输入！'
	}
	return array;
}

const getNewDateArry = () => {
	// 当前时间的处理
	let newDate = new Date();
	let year = withData(newDate.getFullYear()),
		mont = withData(newDate.getMonth() + 1),
		date = withData(newDate.getDate()),
		hour = withData(newDate.getHours()),
		minu = withData(newDate.getMinutes()),
		seco = withData(newDate.getSeconds());

	return [year, mont, date, hour, minu, seco];
}

const dateTimePicker = (startYear, endYear, date) => {
	// 返回默认显示的数组和联动数组的声明
	let dateTime = [],
		dateTimeIndex = [],
		dateTimeArray = [
			[],
			[],
			[],
			[],
			[],
			[]
		],
		start = startYear || 1978,
		end = endYear || 2100,
		// 默认开始显示数据
		defaultDate = date ? [...date.split(' ')[0].split('-'), ...date.split(' ')[1].split(':')] : getNewDateArry(),
		$defaultDate = [`${defaultDate[0]}年`, `${defaultDate[1]}月`, `${defaultDate[2]}日`, `${defaultDate[3]}时`,
			`${defaultDate[4]}分`, `${defaultDate[5]}秒`
		];
	// 处理联动列表数据
	/*年月日 时分秒*/
	dateTimeArray[0] = getLoopArray(start, end, '年'); // 年
	dateTimeArray[1] = getLoopArray(1, 12, '月'); // 月
	dateTimeArray[2] = getMonthDay(defaultDate[0], defaultDate[1]); //日
	dateTimeArray[3] = getLoopArray(0, 23, '时'); // 时
	dateTimeArray[4] = getLoopArray(0, 59, '分'); // 分
	dateTimeArray[5] = getLoopArray(0, 59, '秒'); // 秒

	dateTimeArray.forEach((item, index) => {
		dateTimeIndex.push(item.indexOf($defaultDate[index]));
	});
	 
	return {
		dateTimeArray,
		dateTimeIndex,
		dateTime: defaultDate
	}
}
module.exports = {
	dateTimePicker,
	getMonthDay
}
